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vincentkeymer vs MITerryble

loss

Date: 2026-03-24 18:13:23 | Game Link

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5 key moments

Game Snapshot

English Opening: Agincourt Defense

Crucial Positions

	move #	position	classification	description
Move #: 59 Move: Bxf6 missed opportunity Endgame missed stronger move (gap 161cp)	59	Bxf6	missed opportunity	Endgame missed stronger move (gap 161cp)
WHAT HAPPENED Move Played: Bxf6 White captured the pawn on f6 with 59.Bxf6. The bishop landed on f6, but this move left the rook on h3 completely undefended. Black immediately exploited the hanging rook with 59...Qf5, attacking the rook on the long diagonal. White lost the rook and the game slipped into a losing endgame. WHY IT'S BETTER Engine suggested: Kb2 The engine’s move 59.Kb2 keeps the king safe and protects the rook on h3 indirectly. After 59...f5 the rook remains defended, preserving material. By not creating a new target (the bishop on f6), White avoids the forced loss of the rook and stays in a drawable position. KEY PRINCIPLE Never create a new, more valuable target: Before grabbing a pawn, ensure your pieces remain defended; a material gain is worthless if it leaves a higher‑value piece hanging.
Move #: 66 Move: Kc4 mistake Endgame error compounded existing disadvantage	66	Kc4	mistake	Endgame error compounded existing disadvantage
WHAT HAPPENED Move Played: Kc4 White moved the king from b3 to c4 (66.Kc4). This walk placed the king directly in the line of the black queen on b1. Black can now play 66...Qb3+ delivering a check that also attacks the rook on h2, leading to a decisive material loss. WHY IT'S BETTER Engine suggested: Ka3 The engine recommends 66.Ka3, which keeps the king away from the queen’s file, protects the b3 square, and maintains the defense of the rook. After 66...Qb3+ the white king on a3 would still defend the rook, preventing the immediate loss. KEY PRINCIPLE Keep the king out of opponent’s lines: Never step onto a square where the enemy queen (or rook) can give a checking attack that also wins material.
Move #: 75 Move: Kg5 blunder Midgame error lost winning advantage	75	Kg5	blunder	Midgame error lost winning advantage
WHAT HAPPENED Move Played: Kg5 White played 75.Kg5, a passive king move that does nothing to improve the position. The powerful rook on h2 and queen on h8 remain idle while Black’s queen on d3 dominates the board. No immediate threats are created, and Black continues to harass the white pieces. WHY IT'S BETTER Engine suggested: Rb2+ The engine’s 75.Rb2+ forces a check on the black king on b7. After 75...Kc6 (or similar), White wins material or creates decisive mating threats. The checking move exploits the exposed black king and converts the material advantage, whereas Kg5 wastes a tempo. KEY PRINCIPLE When you have a winning attack, deliver a forcing move: A check that wins material is always superior to a quiet king move.
Move #: 78 Move: Kg6 blunder Midgame error lost winning advantage	78	Kg6	blunder	Midgame error lost winning advantage
WHAT HAPPENED Move Played: Kg6 White chose 78.Kg6, moving the king away from the center of action. This leaves the queen on h8 and rook on h2 without coordination, while Black’s queen on c5 continues to dominate. No new threats are generated, and Black retains the initiative. WHY IT'S BETTER Engine suggested: Rb2+ Engine’s 78.Rb2+ gives an immediate check on the black king on b7. After 78...Qb5 (or 78...Kc6), White either wins the black queen or forces a winning exchange. The checking move capitalizes on the exposed king, whereas Kg6 simply loses momentum. KEY PRINCIPLE Prioritize forcing checks over king shuffles when you have the attack: A well‑placed rook check can turn a winning position into a win, while a king move often wastes critical time.
Move #: 79 Move: Kg7 blunder Midgame error lost winning advantage	79	Kg7	blunder	Midgame error lost winning advantage
WHAT HAPPENED Move Played: Kg7 White played 79.Kg7, again moving the king instead of exploiting the immediate tactical possibilities. The queen on h8 and rook on h2 stay passive while Black’s queen on d5 controls key squares, keeping the pressure on White’s king and rook. WHY IT'S BETTER Engine suggested: Rb2+ The engine suggests 79.Rb2+! delivering a check that forces the black king to move and leaves the black queen vulnerable. This check either wins the queen or leads to a winning material gain. Kg7 forfeits this decisive opportunity. KEY PRINCIPLE Never ignore a winning check: When a checking move wins material or leads to mate, it trumps any king maneuver; always scan for forcing moves first.

Master Lens

VincentKeymer opened the English Agincourt Defense with precise piece placement and a strong central pawn push, showing how active development can give a comfortable game (opening accuracy 95%). However, a series of missed tactical chances in the endgame and several passive king moves in the midgame turned the tide, leading to a loss. The game illustrates the importance of keeping pieces defended, exploiting forcing checks, and never letting the opponent’s queen dominate the board.

What The GM Did Well By Phase

Opening

White quickly developed the knight to f3, the bishop to c4, and the queen to e2, creating a solid central pawn duo on e4 and e5. By castling long on move 12, White connected the rooks and placed the king safely away from the center, demonstrating the principle of rapid development and king safety.

Middlegame

After gaining a material edge, White had a clear winning attack but chose quiet king moves like **75.Kg5**, **78.Kg6**, and **79.Kg7** instead of delivering checks. The stronger moves **75.Rb2+**, **78.Rb2+**, and **79.Rb2+** would have forced the black king into the open and won material. This shows the lesson that when you have a winning attack, a forcing check (especially with a rook) is always better than a king shuffle.

Endgame

In the final phase White captured the pawn on f6 with **59.Bxf6**, but this created a new target on the rook at h3, allowing Black to win the rook with **59...Qf5**. Later, moving the king to **66.Kc4** walked into a queen check that also attacked the rook. The better moves **59.Kb2** and **66.Ka3** would have kept the rook defended and avoided the queen’s line. These moments teach the principle of never creating a more valuable hanging piece and keeping the king out of the opponent’s lines.

Game Themes

promotion castling passed pawns bishop pair connected passed pawn